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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a98ddfca8e3919986bb42f749521f656e165f1f6c9b9969c879eee998c0b63' 
  AND token = '8gxbUJWmeeIg7QCS+ZPTe+S8kJygU6qig/BJVAIfNZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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