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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f7cebcbe1c3a223fbc38154aaaf11546ae77b8618d6ba859224155e5424e17' 
  AND token = '087RLxTHhbGb3/7WDuhVY/LQiDxGxLlaJ20IbZitkpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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