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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72362bc5f2365edd988d16540cae8dce200047724a5f341b489c120e376ca1ab' 
  AND token = 'JdgMJdE2BVUpGeY5fmoNi2eNaVqWUPaxaLW15P9R0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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