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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b17c3ba38f9156cea44cb1ff66bdc454e951c3e0cfb943501e4f4dc4965c01' 
  AND token = 'aYGoSPE6jkhFGsXHg4dhFHeGC4RxLIwKSHo5Z+Ra+RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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