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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99db52e5426886ace677efe420aec18080763cfe7b237c4caa06fa95f99ad96f' 
  AND token = 'NDZgqqM4R7PMQoMAZ74HGNS85iMsFKhXhe9x31zrr9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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