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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0720deb1459e1e831bb273037efe44eefa08d0a5f83fa60473bc5264d4ce88' 
  AND token = '6qMuXDhaZk1oVa62P/K82xt+2rktuBQcm4i7lN9VO6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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