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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a848ce41ed046057da34bb5cbf141e3418f658203319bb31882cb5e8c913eb' 
  AND token = 'LnCQ95xgU8clHRJpYyvW7NzhVL+W4W+HMPkE4kQ4m28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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