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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bbde117272e8571dce0721d5400821a6a7fb14599556f06d7ea91d65aadf2c' 
  AND token = 'iefvwK9GkT6+Q4tRPfxcSBDaFaCgaT1aJhGChrn2B1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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