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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2675de15c476b8a92d004f3120b4a6eecd388211cec2103e4cc373bb0d331868' 
  AND token = '6WfYQehf7Agc9l3CFVHffP9KsJIohw0dfebILzG0BTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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