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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a5bff61085a8ffbee3ffd225e51de002e4551b0c2ca3089a106882e945d6b0' 
  AND token = 'U/L4f8ja3fFeiILb+EM9AtJZ34rzlW5Gp3elMxXjaEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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