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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db44b8c874faebe49afd89a8a45d1d5abeb6acd2b275f00db91cf1fb3c6dc10' 
  AND token = '26euO9fv3F7wVH5n/ud/tl8Ce/W7kti5gRApbSko7Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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