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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830b8e2ec028ee0c7b5566c5ce0d06a8afccb118a936801441de7d004df15b7e' 
  AND token = '/IbJm4XN6MgsGs2lYcMZaKwYp8XfhULUF1VHl8R8/1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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