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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1858eb20dc468b154fe9b2371f88b4d4660651ef197087d60c905e80b7268ff' 
  AND token = '8HP1JKZhkdkRcIOppWxE7vnl2eXKCaXgE6+OUMW3C74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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