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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703a0b0ba49006c6d34358d70b56e2c0abdfcc408bcc6cf6e447496fdb5eedd9' 
  AND token = 'VADxHGDg0b+2sE3cPOFLrBvW3abnHRY6RrPjXoqVYn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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