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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83c1abeaedaf51f5ff73e2ab66faa3b56bb1aa7ae98c0a7768ce6037f1e358f' 
  AND token = '6JMwIHM3ROK4Jhd7mmijyUPkdSMjm1P6tUoZ0L4x4r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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