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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1676c38b490936b4dedb3a1b64af4a112ee20f4ebb69c2811cc3013c1d4ab3e6' 
  AND token = '0NuSpWsKoP5b/jsREuvgZwkSLu/FcZqwVEE4BGVrh+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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