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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac2b1b339bb895914a98f6e62f40dc0d0a3e5baa5b4ea3bc293aaae02295c52' 
  AND token = 'gxaquaclvke+hefTuX0Jq3LzAripSvQaq3u1kRD0UT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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