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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6f97b60ed12d634f34b4e8e4ebe44b77049eec0b4af32fb481b75dfe772217' 
  AND token = 'lP/yF598YR2/mHkds/k+FQTQCqewsdOjs8H2jKEhm8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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