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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb824b450ad01530ac28a0051500dcb7dd009115a9324f4d2f93fb6c6625dfa6' 
  AND token = 'ykYNr11Fg4n2Ci/VTgWVanXt/3R4YhOose2FtZ6if2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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