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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8475e0b6a8400ec9224291b768729d2700f64337ce90e10776634149d43fd398' 
  AND token = 'TdcI8gLr4xShl3KBOeG1Sj0mVGh/70mxf7dqLT1EL6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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