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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a676f8e44c7aa83c0bfaf94b2d6338c8ad15f04cd62236be6d2d5c79f5f85d3f' 
  AND token = 'VTNBOc/pJTNVoavj0FB7LvMgb49Gp70XId7GKWTd9tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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