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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052b4bad0630ecec5ba20198539baf81614298ec90364595a3174a662b0c7d0c' 
  AND token = '+qv2LB0fWj00lGv9pesomEOJTzAHqapFZm5JbkQYLA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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