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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27b3d2d1bd989c6d17f367d56d535d4685eb11822da15eb98586b24a3d7ead9' 
  AND token = 'zZL286RDRGAsL9An4b/nRy7NekB6PNAVXnozxsNXaRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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