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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bc3f4cfbe096b3a73cadd32322870603e32a998c669889027bc1f56ef76794' 
  AND token = 'gXHlYoWvp/cbZ19hiAkRjcfi1cQfW7L4Hbls8INjR2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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