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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154684117d10dd12223f5619a9f992a33bf14bf0e8a65d7cde81274ac0ba4b54' 
  AND token = 'qf/b8CCgjyZ4s4hGTElOFSfHR5Ji6izmTHRRzW/r3ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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