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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04988f8c923f63664ea535bc2a9fb8423ec23ba5841ca90d53a3325d8820c692' 
  AND token = 'tlOQbXUj8Y0+rLCHP5swwjCt+0LYu8lrPKx1mLcYPb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00201

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}