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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95946d7e20c7436e2c34cb8a5d3232e158f33694c07b9730664e1cee22ba96de' 
  AND token = '9EDckYKE/fFjAS4VHgY45feRI0HtY5631PqfmPKPdvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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