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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca358d46e3dce307de24f7e5b00183b2071f3972bb7ef370234f866cf937854' 
  AND token = 'Xr5yxwoVtgmO2BvRzgtAIj6rCCKl1We2/qaPzfeVo/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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