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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375aad6ccad8e65d025809587af85d413ce025b772ef0e0347375dff994b3463' 
  AND token = '5jDxPgcWB/SfpK6uXgmS9hi/HHOREPwZlLof0zccZN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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