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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bbb52347222263d072e3d793304ef1e087d66b2fd294924185e27104b6ac00b' 
  AND token = 'jdUj76L7v1r80/7YNYsZu+tzBXPpEk4QyMkkv8979dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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