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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd934e8fe44e3e0c27063682f8527e5bf47c823209bbd5cc3cf8ccca63cf87032' 
  AND token = 'wDwdTqpMRXveKD8Q0q1ViHCpWAOFz2Ny8p+UOpNGQLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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