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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd6c507dd719166a0848df0eaa17f9a92d7eb68f8ca2195c68d8850e75b93b8' 
  AND token = 'tqaveed0xZs77qFmmO7A5upzk127PhdoJIMiuh2aHso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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