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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811ee87cef50004e46050b1b902bf21eaae457067a14b4afa918187c51c0d2f5' 
  AND token = 'wjUQkwjtjrVECKT0PMlBmxwr6bPRFCjPGbqbV0tNqw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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