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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f22bd7dae20bf4f16704cecec7eca045038fae803fea78dc1ceae9a0859472d' 
  AND token = '7vBA2MvwVL+YMBvnqisQcF9urABpFWCk9yQ3Ea16anE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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