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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7a26cb5f1bb99f4732f4b201752c83e4d8f41bcac6ffa56ea70c1c9f4fbeff' 
  AND token = 'xiHV7AoQG5hm/YY6PevDh75LSPPf8c2P+NmksGJrGkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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