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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38537286d69e9a39b27788de07fb45fafefb95fdf31722aa58c0f4fb8c5bd430' 
  AND token = 'gzX7kn0BdxIgbNk3jZjztVuHt5G14KBo50LhHtsxr6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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