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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c22e0c8aa3f0b98965f5b8f83449a6385bd1835b4afe3589f2cffb1cb387cb' 
  AND token = 'IhT1TsXiAaeEGlPI/z+eQgaOlkyuzFCsu3GuEMMlr6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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