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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7365da432fdab12b2f9ab874240307af00eae3d6b3cb3ca7a140130a8f2fe45' 
  AND token = '/uBKxq2/v4hDQ5Tf67D20j3xH3ygaw278V1EXG+nI/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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