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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c842635f3d7776c322413939d94a31c9370e5c07262f97fe6d8ca50fb55ed6d6' 
  AND token = 'JTJerOFa9dIbmnyIjhR6U+3XwAKAOAoUxQvH8Z+kd10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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