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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cee32d7ba272955b453407ae48e19e766c80f249593ba0a02185293c960eed' 
  AND token = 'nH2xz7FRjJFg88rVs+w12HcGt27+w4F1slyI5gVrz9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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