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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabbe186e8b4371416b7a2caf94e6398ef2660d8e962d21b2c6ff9f7255265e2' 
  AND token = 'YrX6t/3fTub6UFt7jN0X4W7EAbZHP/08NX7f4z5PMDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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