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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da172e09f2f70128175c9bc0c0575fea2251f2f5965d22a1e8c2132edc3969c0' 
  AND token = 'uhyj5ae4Nd18OFMopDZIHxdwctbo1KoD0meYCbQOE08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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