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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2794572ec3b4bf88f11297052ad875d7916bae0e2020a5a70a62208ab8e8791e' 
  AND token = 'LBB7vTs4dPe3CgpDbv2Xa4bmY6q3FZppP5MeWzdsUfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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