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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8483b2c340a973d8a64e321b8b4b9c92dae96e606a374ef316c4bb1bc789ccb6' 
  AND token = '4r5vfZcgx1RRz79B3SpVZSMJDxhpklyQHpN6Y9mVcIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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