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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab05539c3daf4187fb0c8f51d3f4192196c3c05dfc71ecdef0c517e8aa7e68d' 
  AND token = 'syyyR1ROFf+sT5J2B02vngZ6oi+pvMIvKaA6onCNL3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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