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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b70bd679c72b526e8934aac21bafbf1b5419e5e6698650073bf3f3a04b3bc1e' 
  AND token = 'rhhyDWKjMIT/tms2Hps71i9qZoQhlQc1zkJdq9KR4mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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