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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e57d1e526a3849687f3b3d308d75e95074041e209592c9e19c0b31b7eb3aa1' 
  AND token = 'X8E/6n0Q2nADpwX6jJn735vTvqn7mHH/LBQGdWk+sBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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