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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c7b5d0f3f6cea25615501a3fa1fba78c16e1c1f0ca1374fadcb6e16d88f28e' 
  AND token = 'feLsyLUl+K5muSmxjB3oPxoI3gBdZNq3p8egdafqStY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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