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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f29053a906bf52c03981260cd46a79dee29b5ea3ebcd23db76d6f836f836de' 
  AND token = '70eafn4Qc7Y9qE8UsP8KCB4Ej/ZRCbmmZL0uu7qrPKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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