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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d9e96e13d18c9f79d9b29591ad79bc37391c4420a9dd4e2f8997f0875527ae' 
  AND token = 'pE0VC7WPe5FQZL85BUEdDo+NZWWCI0fF69ncpM7FM/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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