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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc6b76ec6da07fa081f6eaf8f14a3f4ad0974b8a3c529ad430a7f217037fa0a' 
  AND token = 'il57/ub1tIwrKhLPBhJGYf56qX4AY6bT7Uo45ZHwKbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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