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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c6a01fffeb89e8479a266c85c5a10c79aabbe906cbd5bec22d5354f1d28f6e' 
  AND token = 'InaKbeRp3ZB+aklhJn+n013Su6UdjXiZh3tnP91becA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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