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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe6ed9469a461823256dbac0594e4b93cd0751eca24190dc61f0ce343d41a2e' 
  AND token = 'YllXWUPptoFuMjAf04Vh+8Al8+MEuwjv5HhVciR9UBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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