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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a06691f84478e8c60506faabf5905ccef8c9941a4d431709f2a2260b7cfae7b' 
  AND token = 'hIp+b/rodvow70Qyw7Y40O+opS7DtqzJdHYDCxRpXJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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