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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738a94ceeb62cad0db9fa551ac737cfac72f1446c50e92e01ea0b1d3ca024cad' 
  AND token = '/pKRd4JgrIdLT7qPAmYOP5Mx/qcPn8IyvFDh+pTmF9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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